[PosterHall] click on a "keyword" (in purple) should add it to Searchbar

[yarikoptic]

Currently searching for a category composed from multiple words, e.g. BOLD fMRI would implement search by splitting them into two and searching for them separately across all fields. That results in hits which do not belong to any category. It requires user know-how ATM to wrap it within "" so it would be "BOLD fMRI" (well -- it might still match phrase in other fields so it is not an exact limiter).

ATM we have categories displayed

but clicking on any just results in going to that room -- they do not have onclick. Would have been nice if clicking on any, would add that category into search thus limiting posters only to that (and any prior entered search query).

if #1467 was implemented then it could paste it with categories: prefix

#1576 could provide an alternative solution.